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In an experimental technique for treating deep tumors, unstable positively charged pions (?, elementary particles with a mass of 2.25 x 10^-28 kg) are aimed to penetrate the flesh and to disintegrate at the tumor site, releasing energy to kill cancer cells. If pions with a kinetic energy of 10 keV are required and if a velocity selector with an electric field strength of 2.40 x 10^3 V/m, what must be the magnetic field strength?
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